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Accounts Receivable Securitization (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2015
Accounts Receivable Securitization      
Trade accounts receivable balance sold $ 161.2 $ 172.8  
Fair value of deferred purchase price notes 99.9 $ 50.9 $ 99.9
Period for which the entity will be able to comply with the financial covenants pertaining to the Receivable Purchase Agreement (in months)     12 months
Maximum      
Accounts Receivable Securitization      
Capacity of securitization program $ 185.0   $ 185.0
Average collection cycle for accounts receivable (in days)     60 days